Armoured Sentinels w/ Lascannons....are they even worth it?

I had the opportunity to pick up three armoured sentinels outfitted w/ lascannons for a very good deal. At first, i thought, AV12 squadron of mobile lascannon teams? Awesome!

Then I realized that guardsmen are completely blind, cause w/ BS3, half the time my sentinels will miss their expensive lascannon shot

Is there something I'm missing about armoured sentinels? I run a squadron of scouts w/ hunter killers and autocannons that outflank and are dead shooty, but I can't seem to find a reason to field my armoured sentinels! If you have a fantastic way of using your armoured sentinels to mess with the enemy, please... tell me!

Manage terrain better than skimmers
Gain cover saves from area terrain
Are more resistant to being shaken/stunned than skimmers
Take up less space on the table
Can tarpit very effectively

but unfortunately

Are not as cost-effective as special weapon spam tactics

Overall, I find them quite useful. Shoot down (and/or kick!) transports in the early game, tarpit in the late game and maybe even send them up a flank to an enemy objective, with side-armor shots along the way. They're a solid, reliable choice that only gets left out because of the trend towards SW alpha-strikes and the profound undercost of Vendettas. Seriously, Lascan Sentinels would need to be 30 points each for their offensive capability to be priced in keeping with the Vend. It's ridiculous.

A vendetta has the exact same ability to resist stunning the same way Sentinels do

But if a sentinel is shaken the others can still shoot.

But i dont think armoured sentinels with lascannons are worth it, 3 of them cost the same amount as 3 lascannon heavy weapon squads. I'd rather tak the lascannon HWSs than the sentinels, and we all know that they're not the most effective choice.

The Emperor Protects

IG Best Gen 1st overall of 10 DE 4th overall of 6Eldar 3rd Overall/Best General of 26--2nd Overall/Best General of 7--1st Overall/Best General of 11

Lascannons are about equal to the much cheaper Autocannon when it comes to stopping transport vehicles, which is their best use. Lascannons are really only necessary for dealing with Tyrannid MCs sporting 2+ and 3+ saves. In which case a Vendetta is the most cost-effective unit for taking them. Twin-Linking means you'll hit 75% of the time.

So if taking Sentinels, put Autocannons on them, deploy them in cover in the middle of your line, and shoot up transports while you hug/deny cover. If you get the chance you can even tarpit assault troops with them.

Both Vendettas and Sentinels have their advantages and disadvantages. Though neither is as fragile as people like to claim.